Configuration of ZK-AC400 with ZK-SRB by ZKTeco

Super Admin
07 May 2026
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ZK-AC400 is connected via the RS-485 connectors:

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The opening time of this relay is 5 seconds, and it is activated only when the ZK-AC400 relay itself is closed, i.e. if the ZK-AC400 relay is set to 3 seconds, the ZK-SRB relay will be activated after these 3 seconds and during its own 5 configured seconds.

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